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#include <stdio.h>

int main() {
	int n=0;
	scanf("%d ", &n);
	int sequence = n/10;
	int result = 0;
	for(int t=0; t < 10; t++) {
		int point = 1;
		for(int i=0; i < sequence; i++){
			char c; scanf("%c ", &c);
			if(c == 'N')
				point = 0;
		}
		result += point;
	}
	printf("%d\n", result);
	return 0;
}